Process for the preparation of trimethine dyestuffs

Details Process for the preparation of trimethine dyestuffs Process for the preparation of trimethine dyestuffs

C - Chemistry, Metallurgy

09

B

C09B 23/06 (2006.01)

Patent

CA 2063097

This invention relates to a process for preparing trimethine dyestuffs of the formula (see formula I) wherein R1 is lower alkyl; R2 is hydrogen, alkyl, cycloalkyl, aryl, aralkyl, alkoxy, cycloalkoxy, aryloxy, aralkoxy, fluorinated alkyl, alkanoyl, aroyl, alkoxycarbonyl, aryl- oxycarbonyl, aralkoxycarbonyl, alkanoylamino, aroylamino, alkylaminocarbonyl, arylaminocarbonyl, alkoxycarbonylamino, alkylsulfonyl, arylsulfonyl, halogen, cyano, nitro, carbamoyl, or sulfonamido, or two R2 together form a fused benzene ring; n is an integer of from 1 to 4; and A- is an anion, by reacting a mixture of (a) an indoline compound of the formula Image (b) 1.25 to 1.8 parts by moles, based on the indoline compound, of acetic anhydride; and (c) 0.5 to 0.75 parts by moles, based on the indoline compound, of formic acid to form the dyestuff.

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